The lungs are a vital part of the respiratory system and are absolutely essential for inhalation and exhalation of air in the human body. The process of breathing enriches the quality and the flow of blood, enhancing the manner in which all the bodily organs function. Normal body temperature varies from person to person, but in general, is 98.6. Having a fever is one sign that you may have a lung infection.

When we become ill or the respiratory system becomes irritated, this chest mucus, or phlegm is produced in larger amounts and the immunoglobulins work hard to fight off invading or foreign bodies.

Several other conditions can also produce chest mucus and subsequent other symptoms. Post nasal drip (PND), classified as the backward flow of mucus draining from the sinus cavities down the throat. The constant dripping associated with post nasal drip typically causes irritation and congestion, and may be accompanied by consistent urges to clear your throat and blow your nose. Irritants, dairy, dry climates, smoking, colds, flu and pregnancy may cause post nasal drip.

Some of the main causes of lung infections or respiratory diseases are pleurisy, pneumonia, cough, common cold, asthma and chronic obstructive pulmonary disease. At times, people could suffer from bacterial lung infections, due to environmental or even occupational factors, which include long term exposure to toxins and air pollutants.

Many patients complain about having an increased amount of mucus when they have COPD. When a lung infection is present, however, mucus production not only increases in amount, but generally gets thicker and stickier, and changes in color. It can also have a foul odor to it.

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